In message
,
Mizter T writes

I expect the TLRN [1] roads to be so treated (and indeed
they were and are), but I got the impression that at least some
Boroughs were making the effort to ensure that other roads (even some
perhaps a little off the well beaten track) which are on bus routes
got gritted too.

Presumably this was as a result of the policy to prioritise clearing
access to bus garages and bus routes (amongst other things) that was
drawn-up by TfL and the London boroughs after snow problems last year.
If so, it's good to see it working.
--
Paul Terry